For growing tomatoes from seed you need to be thinking about sowing tomato seeds about 6 to 8 weeks before you expect the last frost of the year to occur or when you would like to be putting your plants into their final growing position.
From a temperature perspective the best temperature range for sowing tomato seeds is between 15ºC and 25ºC (60ºF to 77ºF) you could probably get away with 10ºC (50ºF) overnight but you would need to cut back on the watering a little to take account of the lower temperatures.
Equipment
You can either purchase Seed Starting Trays and equipment or alternatively you can use items like yogurt pots or egg cartons to get your tomato seeds under way. If you already have pots or seed trays available and want to reuse them then make sure that you disinfect them first with a mix of 1 part bleach and 10 parts water to ensure that you remove any contamination.

